St. Mary's County Public Schools Snow Day Calculator
Will St. Mary's County Public Schools close tomorrow? Check the odds.
Powered by NOAA / National Weather ServicePowered by NOAA / National Weather ServiceWill St. Mary's County Public Schools close tomorrow? Check the odds.
Powered by NOAA / National Weather ServiceSt. Mary's County Public Schools serves Leonardtown and the surrounding area in Maryland, covering 27 schools. When winter weather threatens, the closure decision is made district-wide — which is why the forecast above is centred on the district itself rather than any single campus.
Rural districts run the longest bus routes over the least-treated roads, so they typically close at lower snowfall totals than nearby urban districts — often on forecasts that would leave a city district open.
Maryland averages about 21 inches of snow per year. Maryland districts split between Baltimore-area and DC-area patterns. Western Maryland mountain districts have much higher closure thresholds.
We pull the live forecast for the district's own coordinates and score the factors that drive a closure call: snowfall accumulation and its timing relative to the morning bus run, ice and freezing rain, wind chill, and forecast confidence. The result is a probability for a full closure, a two-hour delay, and an early dismissal.
Districts announce closures between roughly 5 AM and 6 AM, working from conditions on the ground rather than the previous evening's forecast. Weather models are most reliable inside 24 hours, so checking after 6 PM the night before gives you the most accurate read.
This is an independent prediction, not an announcement. Always confirm a closure with St. Mary's County Public Schools directly before acting on it.
All 27 schools in the district.